Automatic firearm



prl 6 1926.

R. VON FROMMER AUTOMATIC FIREARM Filed Jan. 23, 1924 lratented Apr.` 6, 1926.

RUDOLFv VON FEOMMR, OF BUDAPEST, HUNGARY.

AToMATic. FIREARM.'

v'To all 'whom t may-concern:

Be it known that I, RUDOLF voiv FROMMER, a citizen of Hungary, residing at Budapest,

s Hungary, have invented new and useful Im- Vrovements in Automatic Firearms, of which the following is a specification.

This invention relates to an ,automatic firearm the pull-off-mechanism of which, that is the'trigger, the trigger lever or disengager,l and the vhammer are subject to the pressure oi`- one spiral-spring respectively,

that is to the pressure of three spiral springs Y altogether arranged in one single springcase mounted upon the frame by means of pins@ The action of the inain-spring is transmitted to the hammer by the longer arm of a crutch like pressure-piece, the

shorter arm of which is adapted to prevent the hammer from` moving forward over a desired limit when the breech-bolt is re- A moved from` the gun. VIn connection with this pull-of-mechariism the firearm is ar- .ViaIiged such a manner that while' the breech-.bolt remains in its rearward position the, pull-ot-mechanism, p `automatic` safety-device is locked. Accordthat is to say the of the breech-bolt. In kthe example referred to 'in the present description the locking of "the safety-device is performed by the interf lrupt'er of the pull-oE-i'nechanism of the gun.

In the accompanying drawing one form of the embodiment ofA the invention is shown @by way of example. Fig.1 isa longitudinalY sectional view of onev part of the firearm in question, the

'breech-bolt being locked. Fig.- Sis a longibreech-boliJ being in its rearward position.

Fig. 2 shows the -same arrangement the tudinal sectional viewl of the spring-case thesprings being removed. Fig. 4 is afront elevation 'of the spring-case. Y

detailview 'showing a part of the disengager Fig. 5 is a "and its actuating spring. Fig. 6 is a detail "view showing the inteirupter and o'iie part 'of'the automatic safety-device."

` The 'puil-of-inechanisinA consists ofa disengugerl pressed by the trigger whenfiring 'Appiication ined Jamiary Y23,' 1924. sriai No! s873912.Y i

against the action of spiral-spring 2 (see Fig. 5) iii the direction of the arrow shown in Figs. 1 and 2. This spring is located in borsaY of the spring-case 3. The laction of the spiral-spring 2 is transmitted to the diseiigager 1 by the slightly rounded head of pin 5. When firing thes'tooth Got t-lie disengagei1 1 works the arm 9'of the sear 8 pivoted at 7 (Fig.` 2), and presses the same against the action of the spiral-spring 11 provided in bore 10 of the spring-case 3. The other arm 12 of the seal' 8 is thus lifted from the top-notch 14 of the hammer 13 pivoted at 15, Vand in consequence of this action the hammer 1 3 is allowed to be driven forward by main-spring 16 arranged in bore 17 of the spring-case 3. The work of the main-spring 16 is transmitted by a pin 18 provided with a grooved head to a crutch like pressure-piece 19 having a ,70 longer arm 20 that actuates the hammer 13, and a shorter arm 21 which prevents the hammer from shooting forward over a desired limit when the breech-bolt is removed. In case thebreech-bolt is' provided in the firearm the forward movement of the hammer is `limited by the'breech-bolt itself as 'can begseeii in Fig. 2. lVheii the breech- `bolt is removed thel hammer 13 is stopped in its forward movement by the shorter arm 21 of the pressure piece 19 through the striking of the recess 22 of the hammer at the arm 21. The spring-case 3 is fastener to the frame. by means ofwpins 23 and 24,

the'former also serving as afastener for the 85 magazine-holder 26 subject to the pressure of spring 25, whilst y the latterlimits the stroke of the main-spring that is tosay of the Ypin 18 in case lthe hammer is removed from the gun. In connection with this pulloff-mechanism there is provided a safetydevice of well` known type, which diii'ers from those heretofore known by its. being kept locked while the breech-bolt remains in its rearward position, and the features of which are as follows yA recess 28 is arranged oii the breech-bolt 27 for the interrupter 29. lAs it is well known tlieinterrupter is provided to preveiitgthe gun from being fired, unless the breech-bolt is locked, and it also serves to vprevent the firing of more than one shotv closed, for in this caseonly are the recess 283 and the interrupter 29 opposite. each other. The interrupter "29 is provided fon" its lower edge with a tooth 30 thatrests -when "hind 'fthe' 'nose- 33 t 'of aii 'automatic' safety# fitter cgpi'voted at ai teingisiibject to :the

- 'pres'surefof Ispring 25 (Fig,

l* *safety-device* Ithus" being locked"v "against 'fthe *action offspring 25 lwhen the breech is iiifits 7*7 rearward position.

f This locking visnecessaryV because the effect of ""tlie" recoil* resulting trom the *forward frii'sh-ing ofthel breech iii such ftypes ofautov f-j1iatiEV firearmsl tends to' 'work the trigger-, 'inechani'smfand the automatic safety lever device" being in front of theiiose 35 ofthe '.'di'sen'gager l, `Fig. l." In consequence ofthe 'safety lever 32isfpushe`d backwards and takes "keeping Y the' safety lever" l"and fthe triggen" "f thef diseiigage with' it, whereupon' the" iveapoii is vfired. The object of thepr'esent *arrangement-is to prevent thisunii'itended' iiringf'by locking safetylever' and"'c`on"'A i sequentlythel trigger mechanism when'theV lbi'e'eclrbolt' 'is iir the"unclsedposition landmechanism in' this locked "position IuntilI only. r Since, however, atthes'ameltiniejthe j'int'err'u'pter 29 eiiters'tlie recess 28 andthew feo V also be arranged'i'iisuch 'a iiianiierthat a' ffuithertooth of the' interrupter the iiiterrupter 29caii now 'enterithe/ recess a'ction'talres' llever is'subject tovtlie'action' offspring 25 .'disengager l is'en'abl'ed to rush upwards and* forwardits'nose 35 is no 'longer behii'id the wards. Y v g ''Obviously, the present locking devicev may li'aminer orfthle diseiigager, o'r both Iof them,

theautomatie moving the disengager out 'l ating position "and aY spring'v for actua't ','fandcause's the vweaponA to be 'fired uninten-'j i 'tionally th'enose 34 of the autoinatic'safet 30' yto limit 'the movements -its pivot "thereby to h f U, l. df l d .tufh --iao v mec anisin, a spingi,D casing secure o tY e in any other desired combination more of the above said three-trigger elements and one safety-member may be locked by the interrupter 29 without leaving the spirit and the scope of my present invention'. Claims:

l. In an automaticjlirearm, abreech-bolt, van interrupter controlled by said breech-bolt, a trigger, a disengager Ycontrolled lby the trigger n andv by" Ysaid.` interrupter, an autoi matic safety device inV engagement with the saiddisengager in the released position of the safety device, iii combination with finez'iiis'oi the '"said'- interrupter adapted to lock the automatic safetydevice when the breech-bolt is j'uiiclosed *and toI i'iiiloelrithe f on its pivotl thereby to release the hammer Y mechanism, a? spring lcasing secured t''i'the *frame of the-firearm, a mainspring for-'loperatingVvv the vhammerl mechanism, 'aI

Sear Yinto hammer-engaging -p'osition i g .-Jv u. y" saidl springsV being separately 'housediin'said casing. Y e

, 3;y In anautomatic iirea'rni, all'ilIn-mer iiiechanisim a 4pivoted searaldapted': to retain said hammer mechanism` in inoperative position, ailiseiigager Vfor movingsaidf'searfon,1to0

'its pivot Efthereby 1 to releaselj therliamiriei mechanism, la spring casing, pins' for securing lthe spring-casing to thieiirear'm, armagazine *holder secured to 1the -iirearm'by one fof vsaid pins, a maiii :for: operatii'igtthe4k l hammer mechanism,

"ldis'engager out ofitsy Sear-operatingposition,

vall otsaidl 'springs being separately housed' in saicbcasing;

4'.; Inf an 'automatic ,iirearm',jtliejicoinbination of hammer *mech-anismfa' 'pivtedsear z 'adapted to' retain said iHammerniechaiiisin'in inoperative position, a dis'eiigager .'forfinov `ing'said searon its pivotFthjerebyjto releaseV v y fori actuating the :sear'iiitohainiiierfengagiiig nosef 34 ofithe safety-levei1 lbut' beyond it (Fig. '2),v whereby l'the "safetyslever' is 'prei 'vented' from carrying the Vdiseii''ga'ger back# `:and aspringfor aetuating' the searii'ito'ham- 'mer-engaging position,"

iio`

the firearm, Kaniain i said hammer and main spring and having' means for transmitting the action of the spring to the hammer and means for limit- 10 ing the stroke of said hammer.

In testimony whereof I have signed my name to this specification.

RUDOLF v. FROMMER. 

